Journal articles: 'Earth dams'

1

TANI, SHIGERU. "DAMAGE TO EARTH DAMS." SOILS AND FOUNDATIONS 36, Special (1996): 263–72. http://dx.doi.org/10.3208/sandf.36.special_263.

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Zhang, Rui, Shi Chun Chi, and Gao Lin. "Seismic Acceleration Distribution Analysis of High Earth-Rock Dams in Three-Dimensional Space." Advanced Materials Research 243-249 (May 2011): 4623–26. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4623.

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When pseudostatic method is employed to analyze slope seismic stability of high earth- rock dams, earthquake load is computed according to dynamic seismic coefficient figure in the present Specifications for Seismic Design of Hydraulic Structures (DL5073-1997). The figure is only suitable for earth-rock dams lower than 150m. While at the present time, many earth-rock dams to be constructed are higher than 150m. Compared with low dams, high order self-vibrating period of high dams is easy to coincide with seismic predominant period, and high order vibrations are constantly to be activated and amplified, which result in seismic acceleration distribution is different from low dams. With analytical and finite element method respectively, seismic acceleration distribution of high earth-rock dams is analyzed. Suggested dynamic seismic coefficient figure of earth-rock dams 300m-level in height is put forward, which offer a supplement for the present Code for Seismic Design of Hydraulic Structure.

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3

Sultanov, Tokhirjon, Bakhtiyor Yuldoshev, Elyor Toshmatov, Javlonbek Yarashov, Rustam Ergashev, and Mirziyod Mirsaidov. "Strength assessment of earth dams." MATEC Web of Conferences 265 (2019): 04015. http://dx.doi.org/10.1051/matecconf/201926504015.

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A comparative method for estimating the stress-strain state of earth dams under the effect of static load is given in the paper using spatial and plane-strain models. The results of assessment of stress-strain state of several earth dams using these methods are given. Analysis of the results obtained allows us to conclude that a plane calculation model gives results almost identical to the ones obtained with spatial model; in future that can be the basis for developing recommendations on the use of certain calculation models. Some features of stress state in a spatial case are revealed, indicating the occurrence of dangerous areas with the greatest stresses.

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Marcuson III, W. F., P. F. Hadala, and R. H. Ledbetter. "Seismic Rehabilitation of Earth Dams." Journal of Geotechnical Engineering 122, no. 1 (January 1996): 7–20. http://dx.doi.org/10.1061/(asce)0733-9410(1996)122:1(7).

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Sivakumar Babu, G. L., and Amit Srivastava. "Reliability Analysis of Earth Dams." Journal of Geotechnical and Geoenvironmental Engineering 136, no. 7 (July 2010): 995–98. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0000313.

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6

Rasskazov, L. N., and A. S. Bestuzheva. "Seismic stability of earth dams." Hydrotechnical Construction 26, no. 2 (February 1992): 91–99. http://dx.doi.org/10.1007/bf01545486.

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7

Djehiche, Abdelkader, Rekia Amieur, and Mustafa Gafsi. "Seepage through Earth Dams with Chimney Drain on Pervious Foundation." Advanced Materials Research 452-453 (January 2012): 538–42. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.538.

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This paper presents an experimental study of a homogenous earth dam. The work is focused to the search of solutions of problems encountered in the earth dams after their construction. One of the major problems is the choice and design of systems of drainage. The effective drainage system to prevent harmful accumulations of excess water is one of the most important roles of dams. Efficient drainage systems can improve the safety of earth dams. The paper presented herein reports the results obtained from the experimental study. Empiric relations have been obtained which can be help in the control of the flow rate in the chimney drain of the earth dams on pervious foundation, which can increase safety earth dams

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8

Ri, Yong Nam, Un Chol Han, Ui Jun Jang, Dok Yong Jong, and Chol Ung Kim. "Study on Stability Reduction Characteristics of Earth and Rockfill Dams under Rapid Drawdown Using Fully Coupled Seepage-Stress Analysis." Advances in Civil Engineering 2022 (January 22, 2022): 1–13. http://dx.doi.org/10.1155/2022/7954991.

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It can be a great expense to examine individually the stability of earth and rockfill dams on rapid drawdown in civil engineering practice. The aim of this present work is to clarify the safe type on the rapid drawdown among the most common types of earth and rockfill dams and to introduce cheaply the types in dam design. First, a transient analysis of saturated-unsaturated seepage coupled with stress is carried out in the cross sections of typical earth and rockfill dams the during rapid drawdown, and the safety factors of the upstream slopes are determined by the shear strength reduction method. Then, the typical dams are compared for the stability characteristics so that designers can select the safe type of earth and rockfill dams on rapid drawdown. The obtained results show that the decreasing rate of safety factor in a central core dam is 0.72–0.85 times than one of the homogeneous dams and 0.17–0.40 times than one of the sloping upstream core dams so that it is more stable than other earth and rockfill dams during rapid drawdown.

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M Abbas, Jasim, and Zainab Ali Mutiny. "SLOPE STABILITY ANALYSIS FOR EARTH DAMS USING (GEO-SLOPE/W)." Diyala Journal of Engineering Sciences 11, no. 1 (March 1, 2018): 70–81. http://dx.doi.org/10.24237/djes.2018.1112.

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The study of slope stability is important in the design and construction of the earth dams under influence of special states. Some factors affect on the slope stability for the earth dams such as change the water level in the reservoir, dam configuration, material properties..etc. In this study, the factor of safety of upstream slope stability for number of exist earth dams has been assessed. To achieve the objective of this study, Geo-SLOPE/W program that based on limit equilibrium methods was used. Taking into account the case of dry condition and gradually rise of water level in upstream part for these dams. It can be seems that the slope stability of the earth dams increased in case of dry condition. In addition, the slope stability increased when the water reach to maximum value.

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10

Yegian, M. K., E. A. Marciano, and V. G. Ghahraman. "Seismic Risk Analysis for Earth Dams." Journal of Geotechnical Engineering 117, no. 1 (January 1991): 18–34. http://dx.doi.org/10.1061/(asce)0733-9410(1991)117:1(18).

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11

Ge, Louis, Yu Bao, Chin-Kuan Ni, and Hon-Yim Ko. "Seismic centrifuge modelling of earth dams." Geomechanics and Geoengineering 5, no. 4 (December 2010): 247–57. http://dx.doi.org/10.1080/17486025.2010.492243.

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12

Kanarskii, V. F. "Effect of seepage on earth dams." Hydrotechnical Construction 21, no. 1 (January 1987): 19–21. http://dx.doi.org/10.1007/bf01424898.

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13

Pepper, R. G., and K. L. Burke. "Clay lining of leaking earth dams." Agricultural Water Management 17, no. 4 (March 1990): 379–90. http://dx.doi.org/10.1016/0378-3774(90)90087-f.

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14

Pagano, L., A. Desideri, and F. Vinale. "Interpreting Settlement Profiles of Earth Dams." Journal of Geotechnical and Geoenvironmental Engineering 124, no. 10 (October 1998): 923–32. http://dx.doi.org/10.1061/(asce)1090-0241(1998)124:10(923).

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15

Siyahi, Bilge, and Haydar Arslan. "Earthquake induced deformation of earth dams." Bulletin of Engineering Geology and the Environment 67, no. 3 (June 13, 2008): 397–403. http://dx.doi.org/10.1007/s10064-008-0150-5.

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16

Knoesen, J. S. "Probabilistic safety evaluation of earth dams." International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 28, no. 6 (November 1991): A381—A382. http://dx.doi.org/10.1016/0148-9062(91)91532-v.

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17

MAKOVETSKYI, B., О. DIACHENKO, and М. TROSHYN. "INVESTIGATION OF THE TECHNICAL CONDITION OF WATER DISCHARGE DEVICES OF HYDRAULIC STRUCTURES." Ukrainian Journal of Civil Engineering and Architecture, no. 1 (013) (April 14, 2023): 52–58. http://dx.doi.org/10.30838/j.bpsacea.2312.280223.52.918.

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Problem statement. Hydrotechnical structures undergo a process of inspection for their technical condition. This is necessary to maintain the durability of the structure. In the process of operation, structural defects occur, which are difficult to examine and investigate, due to the impossibility of access for visual inspection. Such defects include those formed in the body of gravity-type earth dams. This applies, first of all, to structures and devices that are located in the body of dams during their construction. They include, in particular, spillways and pipelines. Defects in these structures lead to leakage of water into the body of the dam, which eventually collapses from the inside. Timely detection of defects prevents the destruction of dams due to urgent repairs, and this extends the durability of the structure. The purpose of the article is to develop an analytical-instrumental method of finding, without destroying the body of the dam, erosional, loosened areas in leakage zones, and determining their volumes. Method. A modern method of geophysics, which is electrotomography, is used. As a theoretical justification, the method of the Earth's natural pulsed electromagnetic field (MENPEF) was taken as a basis. The result of the research is the development of a methodology using the methods of engineering geophysics: the method of the Earth's natural pulsed electromagnetic field (MENPEF) and geoelectric tomography. Scientific novelty lies in the fact that the method was developed for the first time for the examination of earth dambs spillways. Practical value. With the help of the developed method, in the future it will be possible to conduct surveys for earth dams of hydrotechnical structures for all organizations that are engaged in such work and have the necessary tools. Conclusions. An analytical-instrumental method of researching the sections of earth dams that cross the structures of ponds spillways and reservoirs has been developed. The location of the loosened soil halo around the spillway pipes inside the body of the earth dam was identified, and the volume of such soil was determined.

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18

He, Lu, Shijun Wang, Yanchang Gu, Qiong Pang, Yunxing Wu, Jiefa Ding, and Jihao Yan. "Seepage behavior assessment of earth-rock dams based on Bayesian network." International Journal of Distributed Sensor Networks 17, no. 12 (December 2021): 155014772110586. http://dx.doi.org/10.1177/15501477211058672.

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Seepage behavior assessment is an important part of the safety operation assessment of earth-rock dams, because of insufficient intelligent analysis of monitoring information, abnormal phenomena or measured values are often ignored or improperly processed. To improve the intelligent performance of the monitoring system, this article has established an assessment framework covering project quality, maintenance status, monitoring data analysis, and on-site inspection based on the relevant norms of seepage safety assessment of earth-rock dams and the expert survey scoring method, and the Leaky Noisy-OR Gate extended model were used to determine the probability of events, and the dynamic and static Bayesian networks used to assess the possibility of seepage failure of earth-rock dams and diagnose the most likely cause of failure. The function of static and dynamic Bayesian networks to assess the seepage behavior of earth-rock dams, abnormal measured values, and causes of anomalies can make up for the limitations of reservoir management personnel and monitoring system in seepage failure experience and seepage knowledge of earth-rock dams and enable better handling of abnormal phenomena and monitoring information, making the monitoring system more intelligent.

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19

Salyamova, K. D., and A. T. Buriev. "Non-stationary problem of high earth dam under seismic impact." E3S Web of Conferences 401 (2023): 01081. http://dx.doi.org/10.1051/e3sconf/202340101081.

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The design, construction, and operation of high earth dams on the territory of seismogenic zones of Uzbekistan set the task for researchers to improve the calculation methods and algorithms for various kinds of loads to which the structure is subjected. At present, the application of the dynamic method (a wave theory) to the calculation of an earth structure, i.e., the dynamic stress-strain state of high earth dams under seismic impact within the framework of wave theory, is the most difficult problem in the mechanics of a deformable rigid body. In the example of the operating Charvak high earth dam, the numerical method of finite differences solved the problem of studying the stress-strain state with shear dynamic impact on the base (such as the records of a real seismogram of an earthquake). At the boundaries of the considered finite region of the base, the so-called radiation conditions are set, i.e., diffraction is not considered. The result of solving the non-stationary problem is presented as isolines of displacements and stresses along the dam's body, depending on time. At that, the most vulnerable zones of the considered earth dam were identified.

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20

Lee, Jong-Wook, Jiseong Kim, and Gi-Chun Kang. "Seepage Behavior of Earth Dams Considering Rainfall Effects." Advances in Civil Engineering 2018 (July 15, 2018): 1–9. http://dx.doi.org/10.1155/2018/8727126.

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More than 60% of annual rainfall in Korea is concentrated during the monsoon season from June to August because of the climate characteristics of East Asia. In general, reservoir water levels sharply rise during this period and rock-fill dams are exposed to various types of damages such as soil erosion and piping related to seepage problems. However, the detection of seepage problems is generally more difficult because rainfall directly flows into a V-notch weir according to a downstream shell in which seepage rates can be measured downstream. In this paper, rainfall is filtered out from the measured seepage rates to evaluate the effects of rainfall by using a digital filtering method for two large rock-fill dams (Dams A and B). Seepage behavior for these two large rock-fill dams was estimated as a steady-state condition. It has been proven that with the application of a digital filter which filters out rainfall-induced infiltration into a downstream shell from a measured seepage flow would make analyzing the seepage behavior of dams more effective. This also shows that consideration for any rainfall effect on the seepage behavior of earth dams is very important. The seepage rate of Dam A was not significantly affected by rainfall because the seepage water was collected inside the dam body and was transferred to a V-notch weir located downstream from the dam through a steel pipe. On the contrary, the seepage rate of Dam B was greatly influenced by rainfall in the rainy season. Also, the permeability of the core zones for Dams A and B was estimated at 8.5 × 10−5 cm/sec and 2.7 × 10−5 cm/sec, respectively, by a simplified method.

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21

Jitno, Hendra. "Seismic Upgrade of Earth Dams - Australian Practice." Applied Mechanics and Materials 845 (July 2016): 37–51. http://dx.doi.org/10.4028/www.scientific.net/amm.845.37.

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After the introduction of the ANCOLD Guidelines on the dam design to withstand earthquakes in 1998, many dams in Australia have been reviewed on their capacity to withstand earthquakes. As results, many of them have been upgraded in the last two decades to increase their resistance against seismic loading. This paper presents the current methods used in Australia to undertake seismic upgrade for earth dams. The paper firstly presents brief discussion on the current methods of seismic stability assessment of earth dams. It then discusses the advantages and limitations of the available methods for seismic rehabilitation. Finally, it presents one of the case histories of seismic upgrade in Victoria, Australia.

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Bulatov, Georgiy, Nikolay Vatin, Darya Nemova, Yulia Ibraeva, and Philipp Tarasevskii. "Ensuring the Reliability of Earth Dams in Complex Hydrogeological Conditions." Applied Mechanics and Materials 725-726 (January 2015): 342–48. http://dx.doi.org/10.4028/www.scientific.net/amm.725-726.342.

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In the considering problem usual tasks of designing ground dams (evaluation of filter strength, compressibility and ground permeability) are overlaid by new tasks, that have never touched upon earlier, that provide reliability of earth dams under extreme conditions and that are exposed by new additional forces such as intensive deformation and curvature of base. Here are dependences allowing determination of accepted values of earth surface deformation of ground dams on undermined territories. Using this methodology, you can compute required constructively technologic protection measures. Solution of such problems as predicting behavior and degree of reliability from external influence of a dam at given expected deformations, - can be brought into action. Prediction of conventional dams reliability may been carried out without underworking.

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Zumr, David, Václav David, Josef Krása, and Jiří Nedvěd. "Geophysical Evaluation of the Inner Structure of a Historical Earth-Filled Dam." Proceedings 2, no. 11 (August 3, 2018): 664. http://dx.doi.org/10.3390/proceedings2110664.

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Small earth dams usually lack the detailed seepage monitoring system that would provide high resolution data on changes in seepage flow. Alternative solution is monitoring of the temperature and electrical resistivity in the body of the dams. Geophysical methods are useful techniques for a non-destructive exploration of the subsurface. We have utilized the combination of electrical resistivity tomography (ERT), ground penetrating radar (GPR) and multi-depth electromagnetical conductivity meter (CMD) techniques to observe the inner structure, especially internal failures, of the historical earth-filled dams. Longitudinal and transversal profiles of four typical fishpond dams in the Czech Republic were measured within this research. The dams were constructed as early as in the 15th century, some of them went through minor reconstruction. The aim of the application of geophysical methods for investigation of old fishpond dams was to detect and localize the boundary of the dam foundation, new earth material from the reconstruction works, cone of water depression, technical objects location, potential internal erosion, cavities, inhomogeneity in the water content pattern and any other anomalies. The primary results show that the ERT is suitable to observe the dam stratification, dam foundation, bedrock below the dam and large anomalies. GPR is suitable for small objects and anomalies detection in the shallow depths.

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MARTINS, Williane M. de O., Marcia C. N. JUSTO, Melissa Q. CÁRDENAS, and Simone C. COHEN. "Metazoan parasite communities of Leporinus macrocephalus (Characiformes: Anostomidae) in cultivation systems in the western Amazon, Brazil." Acta Amazonica 47, no. 4 (December 2017): 301–10. http://dx.doi.org/10.1590/1809-4392201701243.

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ABSTRACT In the Amazon, the growing demand for fish has been boosting the expansion of fish farms. However, the intensification of cultivation can generate disequilibrium in the parasite-host environment, predisposing fish to parasitic infections. The objective of this study was to evaluate the community structure of metazoan parasites in cultivation systems of piauçu, Leporinus macrocephalus, in the state of Acre, Brazil. We examined 100 specimens from a semi-intensive cultivation system (earth tanks) and 100 from an extensive system (dams). Overall 66.5% of the hosts were parasitized. We collected 1,240 parasite specimens, classified in 15 metazoan taxa (10 monogenoidean, one digenean and four nematodes). The parasite prevalence was higher by Monogenoidea in the dams, and by Nematoda in the earth tanks. The parasitic indexes were, in general, low and varied among species. Monogeneoidea had higher values for quantitative and ecological descriptors of parasitism in the dams, while Nematoda had higher values in the earth tanks. A single species of Digenea was found in the dams, with low prevalence. No taxon was classified as central. In the dams, parasite abundance was correlated only with total fish length, while in the earth tanks, it was positively correlated with total length, weight and condition factor of fish. The endoparasite and ectoparasite infracommunities presented higher richness, dominance, diversity and evenness, respectively, in the earth tanks and in the dams. This is the first study of ecological descriptors of parasites of L. macrocephalus in the Amazon.

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Li, Zong Wei, and Da Juan Yin. "The Limit Equilibrium Method in the Application of Earth-Rock Fill Dams Reinforcement." Advanced Materials Research 1065-1069 (December 2014): 236–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.236.

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Limit equilibrium method is commonly used earth-rock fill dams stability calculation method in engineering, this article simply introduces the basic principle of limit equilibrium method, and through a practical project introduced the methods in the application of earth-rock fill dams reinforcement, and achieved good effect.

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Allout, Naas, Taha-Hocine Douara, Salim Guettala, Hicham Charrak, and Tounsia Boudina. "A Comparative Study of the Dam Stability at Various Stages using Numerical Modeling and in Situ Measurements." Engineering, Technology & Applied Science Research 13, no. 2 (April 2, 2023): 10384–88. http://dx.doi.org/10.48084/etasr.5698.

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Earth dams remain the most used means of water mobilization in Algeria, due to their lower cost compared to concrete gravity dams and their capacity to resist better to seismic excitations. A study of the hydraulic structure was carried out in this paper, according to simple rules and empirical approaches. During the last decade, several high earth dams have suffered significant failures of the upstream or downstream slopes at the end of construction, after the initial impoundment, and under seismic loads. To prevent this occurrence or to minimize the damage in these hydraulic structures, a reexamination of the earth dams' behavior using more elaborate calculation methods is necessary. The purpose of the current study is to numerically model the behavior and analyze the stability of earth dams in terms of displacements at the end of construction, after the initial impoundment, during an earthquake, and compare these displacements with those measured in situ. A case study was conducted for the Taksebt - Tizi Ouzou dam by using the Plaxis 2D calculation code and the finite element method. The comparison of the obtained results shows a close concordance with the monitoring results of the dam carried out by various specialized organizations.

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Farias, Márcio Muniz de, and Manoel Porfirio Cordão Neto. "Advanced numerical simulation of collapsible earth dams." Canadian Geotechnical Journal 47, no. 12 (December 2010): 1351–64. http://dx.doi.org/10.1139/t10-032.

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This paper presents a methodology for advanced numerical analysis of earth dams, considering all design stages. It also includes transient analysis of safety factors and can be applied to general three-dimensional conditions, considering unsaturated materials and the interrelation between hydraulic and mechanical phenomena by simultaneously solving equilibrium and continuity conditions. The methodology has been successfully implemented in a finite element program and applied to the analysis of earth dams with sections composed of soils at optimum, dry of optimum, and mixed compaction conditions. The dry section is intended to simulate the so-called “Alka-Seltzer” dams, constructed with poorly compacted and dry material, thus resulting in a meta-stable and collapsible structure. The results show that it is possible to design a less expensive mixed section with approximately the same behavior and in some cases even better performance when compared with the homogeneous section at optimum conditions. This is achieved by strategically placing the optimum materials in the most stressed zones of the earth fill. The safety factor analyses show the importance of considering coupled effects in collapsible dams. In such cases, failure can be simulated in the upstream slope during the first reservoir impounding, as has been observed in some actual cases.

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Qiu, Jianchun, Dongjian Zheng, and Kai Zhu. "Seepage Monitoring Models Study of Earth-Rock Dams Influenced by Rainstorms." Mathematical Problems in Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/1656738.

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For earth-rock dams influenced by rainstorms, seepage status monitoring is very important and provides the basis for the safe and effective operation of earth-rock dams. The most influential factors concerning the seepage of earth-rock dams are the reservoir water level, precipitation, temperature, and timeliness, and the influence of the reservoir water level and precipitation on the seepage of an earth-rock dam exhibits hysteretic effects. The reservoir water level of an earth-rock dam abruptly increases and may exceed the historically highest water level, therein causing new deformations of the earth-rock dam or even plastic deformation. Thus, the permeability coefficient for parts of an earth-rock dam changes, and we present the exceeded water level factor. Considering the complexity of the seepage monitoring of earth-rock dams, based on the hysteretic reservoir water level and precipitation, temperature, timeliness, and the exceeded water level factor, a statistical model based on an explicit function and an artificial wavelet neural network model based on an implicit function are established. Based on these two models, an integrated monitoring model based on maximum entropy theory is established. At the end of this paper, three monitoring models are used for the seepage monitoring of a measuring point of an earth-rock dam influenced by rainstorms, and the results show that the three monitoring models obtain satisfactory predication accuracy.

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Bulatov, G. Ya, and D. S. Gatanov. "Reliability of earth dams on compound base." Magazine of Civil Engineering 30, no. 04 (June 29, 2012): 2–9. http://dx.doi.org/10.5862/mce.30.1.

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Moore, K. A., and R. K. Power. "Safe Buffer Distances for Offstream Earth Dams." Australasian Journal of Water Resources 6, no. 1 (January 2002): 1–15. http://dx.doi.org/10.1080/13241583.2002.11465206.

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31

Huang, Yang H. "Unsteady State Phreatic Surface in Earth Dams." Journal of Geotechnical Engineering 112, no. 1 (January 1986): 93–98. http://dx.doi.org/10.1061/(asce)0733-9410(1986)112:1(93).

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ROFE, BH, RM ARAH, and J. HAY. "INFORMAL DISCUSSION. INSPECTION OF OLD EARTH DAMS." Proceedings of the Institution of Civil Engineers 80, no. 3 (June 1986): 810–13. http://dx.doi.org/10.1680/iicep.1986.690.

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Lapin, G. G., and A. D. Shargorodskii. "Experience in constructing high earth dams abroad." Hydrotechnical Construction 25, no. 5 (May 1991): 283–88. http://dx.doi.org/10.1007/bf01423565.

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Rasskazov, L. N., and I. L. Orekhova. "Optimization of the designs of earth dams." Hydrotechnical Construction 19, no. 7 (July 1985): 361–68. http://dx.doi.org/10.1007/bf01426875.

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Musaev, Z. A. "New designs of spillways at earth dams." Hydrotechnical Construction 20, no. 10 (October 1986): 569–75. http://dx.doi.org/10.1007/bf01427242.

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Rasskazov, L. N., and V. Sepeda. "Optimization of the designs of earth dams." Hydrotechnical Construction 24, no. 1 (January 1990): 30–35. http://dx.doi.org/10.1007/bf01427260.

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37

Xu, Y., and L. M. Zhang. "Breaching Parameters for Earth and Rockfill Dams." Journal of Geotechnical and Geoenvironmental Engineering 135, no. 12 (December 2009): 1957–70. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0000162.

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Lacy, Sara J., and Jean H. Prevost. "Nonlinear seismic response analysis of earth dams." Soil Dynamics and Earthquake Engineering 6, no. 1 (January 1987): 48–63. http://dx.doi.org/10.1016/0267-7261(87)90009-1.

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Mirsaidov, Mirziyod, Elyor Toshmatov, and Bakhtiyor Urinov. "Dynamics of earth dams under shock impacts." E3S Web of Conferences 401 (2023): 05045. http://dx.doi.org/10.1051/e3sconf/202340105045.

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The article provides a detailed analysis of well-known studies, which allow considering the work of the structure together with the base under dynamic influences, adequate replacement of an infinite base with a finite one using non-reflecting conditions on the boundary of the finite region, well-known methods for assessing the behavior of a structure under impact. A mathematical model, method, and algorithm were developed to evaluate the dynamic behavior of earth dams together with the base under shock impact using non-reflective conditions based on Rayleigh waves on the boundaries of the finite area of the base. To simulate a dynamic process, the principle of virtual displacements is used, taking into account the viscoelastic properties of the material. The solution to the problem is conducted by the finite element method and the Newmark method. The dynamic behavior of earth dams, together with the base, is studied, considering non-reflecting conditions under explosive impacts that arise not far from the structure. It was established that during the period of wave travel, a non-synchronous movement of individual parts of the dam occurs, damped due to the wave entrainment of energy and the viscoelastic properties of the material. It was revealed that the maximum principal stresses σ1 occur in the lower part of the upper slope of the dam and gradually spread along the entire dam; the maximum principal stresses σ2 are reached near the foot of the dam and, as the wave propagates, they move along the base directly behind the wavefront; the maximum values of shear stress σ12 are reached on the surface of the upper slope, first at the foot of the dam, then over the entire surface of the slope.

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Ани Геворгян and Роберт Минасян. "ИССЛЕДОВАНИЕ СЕЙСМОСТОЙКОСТИ ГРУНТОВЫХ ПЛОТИН ОТ ДЕЙСТВИЯ МНОГОКРАТНЫХ СЕЙСМИЧЕСКИХ ВОЗДЕЙСТВИЙ, СООРУЖЕННЫХ В ГОРНО- СКЛАДЧАТЫХ РЕГИОНАХ." World Science 1, no. 9(49) (September 30, 2019): 23–27. http://dx.doi.org/10.31435/rsglobal_ws/30092019/6698.

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The problem of seismic stability of homogeneous earth dams constructed in complex geohydrodynamic regions has been solved. The calculations are performed using from the finite element method. Given the great extent at the base of such dams, the general equation of their motion is solved taking into account the well-known “traveling wave” method. It is shown that the offset of the existing viscous-plastic properties of earth dams already under the influence of a one-time strong seismic impact in them residual deformations arise, which subsequently develops even with weak earthquakes. This circumstance must be taken into account when designing such dams.

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Jiang, Zhenxiang, and Jinping He. "Detection Model for Seepage Behavior of Earth Dams Based on Data Mining." Mathematical Problems in Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/8191802.

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Seepage behavior detecting is an important tool for ensuring the safety of earth dams. However, traditional seepage behavior detection methods have used insufficient monitoring data and have mainly focused on single-point measures and local seepage behavior. The seepage behavior of dams is not quantitatively detected based on the monitoring data with multiple measuring points. Therefore, this study uses data mining techniques to analyze the monitoring data and overcome the above-mentioned shortcomings. The massive seepage monitoring data with multiple points are used as the research object. The key information on seepage behavior is extracted using principal component analysis. The correlation between seepage behavior and upstream water level is described as mutual information. A detection model for overall seepage behavior is established. Result shows that the model can completely extract the seepage monitoring data with multiple points and quantitatively detect the overall seepage behavior of earth dams. The proposed method can provide a new and reasonable means of quantitatively detecting the overall seepage behavior of earth dams.

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Zhang, Hexiang, Zongkun Li, Wei Li, Ziyuan Song, Wei Ge, Ruifang Han, and Te Wang. "Risk Analysis of Instability Failure of Earth–Rock Dams Based on the Fuzzy Set Theory." Water 13, no. 21 (November 3, 2021): 3088. http://dx.doi.org/10.3390/w13213088.

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Determining the anti-sliding instability risk of earth–rock dams involves the analysis of complex uncertain factors, which are mostly regarded as random variables in traditional analysis methods. In fact, fuzziness and randomness are two inseparable uncertainty factors influencing the stability of earth–rock dams. Most previous research only focused on the randomness or the fuzziness of individual variables. Moreover, dam systems present a fuzzy transition from a stable state into a failure state. Therefore, both fuzziness and randomness of the influencing factors should be considered in the same framework, where the instability of an earth–rock dam is regarded as a mixed process. In this paper, a fuzzy risk model of instability of earth–rock dams is established by considering the randomness and fuzziness of parameters and the failure criteria comprehensively. We obtained the probability threshold of instability risk of earth–rock dams by Monte-Carlo simulation after the fuzzy parameters were transformed into interval numbers by cut set levels. By applying the proposed model to the instability analysis of the Longxingsi Reservoir, the calculation results showed that the lower limits of risk probability under different cut set levels exceeded the instability risk standard of grade C for earth–rock dams. Compared with the traditional risk determination value, the risk interval obtained with the proposed methods reflects different degrees of dam instability risk and can provide reference for dam structure safety assessment and management.

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Gu, Hao, Xiao Fu, Yantao Zhu, Yijun Chen, and Lixian Huang. "Analysis of Social and Environmental Impact of Earth-Rock Dam Breaks Based on a Fuzzy Comprehensive Evaluation Method." Sustainability 12, no. 15 (August 3, 2020): 6239. http://dx.doi.org/10.3390/su12156239.

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A large proportion of the dams in China are earth-rock dams. Regarding the well-studied loss of life and economic consequences due to dam breaks, this paper introduces the causes and modes of earth-rock dam breaks and the corresponding dam-break losses in terms of the social and environmental aspects. This study formulates the evaluation index system and criteria of earth-rock dam breaks’ impact on society and the environment based on a fuzzy comprehensive evaluation method. The results show that the evaluation grade of the social and environmental impact of the dam break of the Liujiatai Reservoir was “serious”. Therefore, similar dams in China should take corresponding measures in advance to reduce the social and environmental impact of earth-rock dam breaks.

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Lima, Daniel Andrioli de, Guilherme Theodoro Nascimento Pereira de Lima, Vitor Eduardo Molina Júnior, and Laura Maria Canno Ferreira Fais. "Application of a simplified methodology for classification of small dams in cascade." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 17, no. 1 (February 8, 2022): 1–11. http://dx.doi.org/10.4136/ambi-agua.2790.

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Dams pose a high potential risk due to the possibility of rupture. An accident can cause severe consequences for the economy and the environment, besides the loss of human lives. In addition to large dams for power generation, there are also a large number of small earth dams throughout the world, mainly in rural areas, built for the purpose of irrigation or watering animals. Problems with small dams are also frequent, especially in periods of high rainfall when they are more prone to failure. When dams are in cascade, the probability of a rupture is even greater than with an isolated dam, since in most cases small dams do not have enough freeboard to contain the volume coming from the dam further upstream. However, Brazilian legislation relating to water dams only covers the large ones, unless they are classified with high Hazard Potential (DPA for its acronym in Portuguese). Thus, there is no specific legislation for small dams, which means that many of them do not undergo regular inspections and proper safety assessment. This work aims to apply the simplified classification developed by the National Laboratory of Civil Engineering (LNEC for its acronym in Portuguese) for dams in cascade and to compare it to the classification of the Brazilian law for the DPA, evaluating its applicability for small dams. In this way, this method will complement and facilitate decision-making by owners and regulators, thus allowing special attention to the safety of small dams all over the world. Keywords: dams in cascade, dams safety, small earth dams.

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Park, DongSoon, and Tadahiro Kishida. "Shear modulus reduction and damping ratio curves for earth core materials of dams." Canadian Geotechnical Journal 56, no. 1 (January 2019): 14–22. http://dx.doi.org/10.1139/cgj-2017-0529.

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It is essential to obtain shear modulus reduction and damping ratio curves to perform dynamic analyses of earth-cored embankment dams. Many studies have been performed for dynamic properties of clayey soils, but they have been limited for earth core materials of dams. This study conducted resonant column tests to obtain shear modulus reduction (G/Gmax) and damping ratio (D) curves for 31 specimens (17 undisturbed and 14 remolded specimens) from 13 earth-cored embankment dams. Empirical G/Gmax and D curves are proposed for dynamic properties of clayey earth core materials. Fitting curves are provided by using the functional forms of the Ramberg–Osgood and Darendeli models. The observation shows that the undisturbed earth cores yield relatively higher G/Gmax and lower D curves than the remolded cores. G/Gmax curves of compacted earth cores are relatively higher than those of Vucetic and Dobry curves for a similar level of plasticity index. Uncertainty and bias are calculated by performing residual analysis, which shows that there is no clear bias in predicting G/Gmax and the uncertainties between undisturbed earth core materials and natural deposits are at a similar level. A proposed empirical relationship of G/Gmax and D curves for earth core materials can be utilized for dynamic analyses of embankment dams for cases where there is insufficient in situ data.

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Mazaheri, Ahmad R., Mehdi Komasi, Majid Veisi, and Masoud Nasiri. "Dynamic analysis of earth dam using numerical method – a case study: Doyraj earth dam." Acta Geotechnica Slovenica 18, no. 1 (2021): 65–78. http://dx.doi.org/10.18690/actageotechslov.18.1.65-78.2021.

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The precise study of the response of earth dams to earthquakes is one of the most complex issues in the field of soil structures. In this research, dynamic analysis of earth dam structures (a case study: Doyraj dam in the west of Iran) have been performed using 2D Finite Difference Method (2D F.D.M.). The aim of this study is to investigate accelerations, lateral (horizontal) and vertical displacements (i.e. settlements) due to earthquake occurrence. The results of dynamic analysis indicate that the performance of the dam is satisfactory for each one of the seismic scenarios considered in this investigation. The maximum settlements at the dam crest is considerably smaller than that of the dam freeboard, with maximum value of 540 mm, which is comparable to recommendation of the Department of Safety of Dams (DSOD). Depth of sliding surfaces is better shown in the Finn model, and the settlements based on the Finn model is about 2.5 times higher than that of Mohr model. In contrast to what is commonly accepted about earthquake acceleration (the increase in earthquake acceleration from the base to the top of the dam), it cannot generalize to all cases, and it can be limited to very strong dams or can be related to poor earthquakes.

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Asadi, Masoud, Fazlollah Soltani, Abbas Sivandi-Pour, and Ehsan Noroozinejad Farsangi. "Seismic Behavior of Earth Dams with Different Reservoir Water Levels Under Near-Field and Far-Field Earthquakes." Civil and Environmental Engineering Reports 30, no. 4 (December 1, 2020): 125–41. http://dx.doi.org/10.2478/ceer-2020-0055.

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Abstract The height of reservoir water is one of the important factors affecting the seismic behaviour of earth dams. A large number of earth dams have been constructed in different countries that are sometimes located in a high-risk geographical zone. The studies on the seismic behaviour of earth dams have been conducted for several decades. However, this study, considering the importance of the subject, it investigates the seismic behaviour of Sumbar rock-fill embankment dam under near- and far-field earthquakes with variation in the water level behind the dam. The ratio of water height of the dam to dam height is considered as an important indicator to investigate the seismic performance of these structures. The analyses were performed using the ABAQUS finite element platform, under 7 near-field and 7 far-field earthquake records. In this research, the changes in dam stresses, displacements, and failure of the dam have been discussed. The results indicated that the effect of near-field earthquakes on the seismic behaviour of earth dams is more significant than far-field earthquakes.

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Mirsaidov, Mirziyod, Tokhirjon Sultanov, Javlon Yarashov, and Elyor Toshmatov. "Assessment of dynamic behaviour of earth dams taking into account large strains." E3S Web of Conferences 97 (2019): 05019. http://dx.doi.org/10.1051/e3sconf/20199705019.

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This paper presents the results of the assessment and prediction of the dynamic behavior of earth dams of various heights, taking into account large strains (geometric nonlinearity) and inhomogeneous features of structures under multi-component kinematic effects. A mathematical model, methodology and algorithm for estimating dynamic behavior of earth dams taking into account inhomogeneous features of structures and large strains in spatial and plane statements are given. Dynamic behavior of the models of the Pachkamar, Gissarak and Nurek earth dams has been studied taking into account large strains and inhomogeneous features of structures in various pre-resonant and resonant modes under multi-component kinematic effect. A number of new effects associated with the manifestation of large strains in the structure under various dynamic influences are revealed.

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Yuen, Kai Wan, Edward Park, Melda Hazrina, Muh Taufik, Putu Santikayasa, Edgardo Latrubesse, and Janice Ser Huay Lee. "A Comprehensive Database of Indonesian Dams and Its Spatial Distribution." Remote Sensing 15, no. 4 (February 8, 2023): 925. http://dx.doi.org/10.3390/rs15040925.

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Dams are infrastructural projects with multiple uses that include hydropower, irrigation, water storage, flood management, and recreation. Most research on dams in Southeast Asia focuses on the Mekong River Basin and there is limited research on dams in Indonesia. Here, we developed a comprehensive database of dams in Indonesia derived from global and local datasets. We also used Google Earth Pro to locate additional dams and to validate the presence of all the dams. Our database had a total of 1506 dams (from large to mini dams and run-of river dams) in operation or under construction, and this was three times the number of dams reported in Indonesia’s national database for dams. There were another 250 planned dams, of which, only 30 had known locations. Our database also includes information such as the geographical coordinates of each dam, their physical characteristics, and what each dam is used for. Ultimately, we hope that our work will help researchers, non-government organizations, and government agencies with hydrological and socio-ecological research in Indonesia.

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Shi, Zhen Ming, You Quan Wang, Jian Feng Chen, Zu Guang Shang, and Xiao Tao He. "Effect of Fill Size on the Stability of Barrier Dams." Applied Mechanics and Materials 90-93 (September 2011): 1373–82. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.1373.

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The fills of barrier dams commonly result from high-speed landslides debris flow. In this paper, four model tests were conducted to study the effect of fill size on the stability of barrier dams. The failure time, failure mode, pore pressures and earth pressures were then observed and analyzed. The results show that barrier dams composed of coarse-grains or well-graded fills are more stable than those composed of fine-grained fills; coarse-grain-dams are more sensitive to the rising of water level than fine-grain-dams; the failure mode of coarse-grain-dams is usually overflowing-erosion and the barrier dams usually fail from the top of dams; the failure mode of fine-grain-dams is sliding and the barrier dams fail initially from the slope downstream.

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Journal articles on the topic 'Earth dams'

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